Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals
Abstract
In situ transmission electron microscopy observations of uniaxial compression of sub-300 nm diameter, cylindrical, single-crystalline 6H-SiC pillars oriented along 〈0001〉 and at 45° with respect to 〈0001〉 reveal that plastic slip occurs at room-temperature on the basal {0 0 0 1} planes at stresses above 7.8 GPa. Using a combination of aberration-corrected electron microscopy, molecular dynamics simulations and density functional theory calculations, we attribute the observed phenomenon to basal slip on the shuffle set along 11̄00. By comparing the experimentally measured yield stresses with the calculated values required for dislocation nucleation, we suggest that room-temperature plastic deformation in 6H-SiC crystals is controlled by glide rather than nucleation of dislocations.
Keywords:
Dislocations / Molecular dynamics / Plasticity / Silicon carbide / Transmission electron microscopySource:
Acta Materialia, 2014, 80, 400-406Publisher:
- Elsevier Ltd
Funding / projects:
- AFOSR (Dr. Ali Sayir) FA9550-10-1-0496 and FA9550-11-10273.
- User project at the National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under Contract No. DE-AC02-05CH11231.
- Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)
DOI: 10.1016/j.actamat.2014.07.066
ISSN: 1359-6454
WoS: 000344208300036
Scopus: 2-s2.0-84906529544
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Kiani, S. AU - Leung, K.W.K. AU - Radmilović, V. AU - Minor, A.M. AU - Yang, J.-M. AU - Warner, D.H. AU - Kodambaka, S. PY - 2014 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5771 AB - In situ transmission electron microscopy observations of uniaxial compression of sub-300 nm diameter, cylindrical, single-crystalline 6H-SiC pillars oriented along 〈0001〉 and at 45° with respect to 〈0001〉 reveal that plastic slip occurs at room-temperature on the basal {0 0 0 1} planes at stresses above 7.8 GPa. Using a combination of aberration-corrected electron microscopy, molecular dynamics simulations and density functional theory calculations, we attribute the observed phenomenon to basal slip on the shuffle set along 11̄00. By comparing the experimentally measured yield stresses with the calculated values required for dislocation nucleation, we suggest that room-temperature plastic deformation in 6H-SiC crystals is controlled by glide rather than nucleation of dislocations. PB - Elsevier Ltd T2 - Acta Materialia T1 - Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals EP - 406 SP - 400 VL - 80 DO - 10.1016/j.actamat.2014.07.066 ER -
@article{ author = "Kiani, S. and Leung, K.W.K. and Radmilović, V. and Minor, A.M. and Yang, J.-M. and Warner, D.H. and Kodambaka, S.", year = "2014", abstract = "In situ transmission electron microscopy observations of uniaxial compression of sub-300 nm diameter, cylindrical, single-crystalline 6H-SiC pillars oriented along 〈0001〉 and at 45° with respect to 〈0001〉 reveal that plastic slip occurs at room-temperature on the basal {0 0 0 1} planes at stresses above 7.8 GPa. Using a combination of aberration-corrected electron microscopy, molecular dynamics simulations and density functional theory calculations, we attribute the observed phenomenon to basal slip on the shuffle set along 11̄00. By comparing the experimentally measured yield stresses with the calculated values required for dislocation nucleation, we suggest that room-temperature plastic deformation in 6H-SiC crystals is controlled by glide rather than nucleation of dislocations.", publisher = "Elsevier Ltd", journal = "Acta Materialia", title = "Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals", pages = "406-400", volume = "80", doi = "10.1016/j.actamat.2014.07.066" }
Kiani, S., Leung, K.W.K., Radmilović, V., Minor, A.M., Yang, J.-M., Warner, D.H.,& Kodambaka, S.. (2014). Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals. in Acta Materialia Elsevier Ltd., 80, 400-406. https://doi.org/10.1016/j.actamat.2014.07.066
Kiani S, Leung K, Radmilović V, Minor A, Yang J, Warner D, Kodambaka S. Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals. in Acta Materialia. 2014;80:400-406. doi:10.1016/j.actamat.2014.07.066 .
Kiani, S., Leung, K.W.K., Radmilović, V., Minor, A.M., Yang, J.-M., Warner, D.H., Kodambaka, S., "Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals" in Acta Materialia, 80 (2014):400-406, https://doi.org/10.1016/j.actamat.2014.07.066 . .